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Why did the E-Brake on my 997 Release on its own

  • 2008
  • 911 Carrera 4S
32 000
Apple Valley, 

I was letting my 997 warm up while I put away some things in my garage.  The car ran for approximately 5 minutes when I heard a clunking sound and watched as the car raced down my driveway and finally came to a rest in a grassy field across the street.  The front of the car was facing toward the bottom of the driveway.  The driveway is a steep hill, however the car was running with the e-brake applied on the semi-flat area of the driveway.  It is a manual transmission car, when I caught up with the car, its e-brake handle was in the downward/unapplied position.  Thankfully nobody was hurt, and the car only sustained front end damage from the impace of going from steep hill to flat road below.

What would cause the e-brake to release on its own?  Is there anything I should have my mechanic check out while it is being repaired?

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